I don't develop, but "a few things" DRASTICALLY contrasts with my experience actually trying to use GTK as a user. Number changes in GTK BREAK ALL THE THINGS AL

I don't develop, but "a few things" DRASTICALLY contrasts with my experience actually trying to use GTK as a user. Number changes in GTK BREAK ALL THE THINGS ALL THE TIME. It REALLY doesn't make sense to me how badly, e.g. themes break between versions. Offhand, I can't think of too many "standards" that break that badly, it just makes no sense to me that GTK2, GTK3, GTK4 apps simply CANT co-exist. Like AT ALL, without severe uglification.